Lidia Achour returns to Peranne following the disappearance of her former partner, Jean Benefro. In addition to Jean's disappearance, a series of gruesome murders pushes Lidia to investigate relentlessly, at the risk of awakening a painful past that everyone thought buried.

The film follows Vincent who works the night shift on the Grand Ciel building site, which is set to be a futuristic district. When a worker disappears, Vincent and his colleagues suspect the team leader of hiding the body somewhere on site. But Vincent is soon party to strange manifestations, and another worker disappears.

Jérôme fell in love with a young woman whom he tries to seduce. Day after day, he tells the evolution of the operations to his friend Patrick who gives his advice and lives by proxy the adventures of his younger friend.